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USGS Daily Statistics for Illinois

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The statistics generated from this site are based on approved daily-mean data and may not match those published by the USGS in official publications. The user is responsible for assessment and use of statistics from this site. For more details on why the statistics may not match, click here.

USGS 05525000 IROQUOIS RIVER AT IROQUOIS, IL


Iroquois County, Illinois
Hydrologic Unit Code 07120002
Latitude  40°49'23", Longitude  87°34'54" NAD83
Drainage area 686  square miles
Gage datum 614.13 feet above NAVD88
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00060, Discharge, cubic feet per second,
Day of
month		 Mean of daily mean values for each day for water year of record in, ft3/s   (Calculation Period 1944-10-01 -> 2025-09-30)

Calculation period restricted by USGS staff due to special conditions at/near site
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
1 834 697 1,020 1,130 1,090 873 732 208 185 205 276 525
2 803 691 992 1,140 1,090 875 681 187 199 203 294 523
3 803 679 970 1,150 1,040 854 650 181 202 203 316 523
4 807 673 996 1,190 981 786 616 177 187 219 315 513
5 811 715 1,100 1,180 928 754 582 170 173 214 310 501
6 811 735 1,100 1,180 864 770 535 178 165 209 307 487
7 791 704 1,080 1,160 826 779 489 190 163 206 296 486
8 784 667 1,070 1,120 820 792 482 197 156 201 278 498
9 774 666 1,080 1,070 814 820 562 183 161 204 263 490
10 733 710 1,110 1,040 819 845 604 179 169 212 250 477
11 715 718 1,180 1,030 823 855 615 171 175 220 259 482
12 717 726 1,180 1,060 853 872 638 160 177 238 276 514
13 730 726 1,170 1,070 917 947 661 159 181 238 280 527
14 736 741 1,170 1,070 961 976 677 154 215 239 290 518
15 716 769 1,150 1,070 972 1,000 652 142 253 238 312 551
16 699 768 1,130 1,070 971 988 591 136 254 242 334 581
17 657 808 1,100 1,070 972 949 525 138 242 274 363 570
18 623 862 1,100 1,050 969 916 488 149 232 301 382 548
19 611 905 1,120 1,040 951 880 468 161 223 300 414 522
20 606 930 1,150 1,030 927 848 461 177 207 291 431 496
21 607 1,050 1,150 1,020 902 815 465 185 192 279 429 497
22 618 1,120 1,120 1,000 861 784 483 183 189 283 417 555
23 646 1,170 1,080 1,000 834 755 468 180 196 298 415 580
24 701 1,210 1,060 981 796 731 446 162 205 331 427 588
25 707 1,170 1,030 982 773 720 418 149 204 351 422 616
26 699 1,110 1,020 981 783 720 381 155 200 362 428 627
27 696 1,070 1,020 993 784 731 346 154 196 359 447 645
28 705 1,070 1,070 1,010 794 794 317 149 203 343 479 672
29 705 657 1,100 1,030 813 787 278 160 210 321 501 735
30 715   1,110 1,050 822 761 249 168 206 299 519 786
31 715   1,120   861   235 165   289   834